Barred out and renumbered BSA bolt in my 1936/40 Lithgowicon----BNP stamp on the bottom of the knob matches others on barrel, bolthead and receiver.
Whatever Fringe-of-Empire had this rifle post WW2, I am grateful to them for the bolt as it is---the Aussies would have switched it out for a proper Lithgow.
-----krinko

Attachment 14797